It's very difficult and risky, for power off or short circuit might happen if careless.

其风险高、难度大，稍有疏忽就会造成掉电或短路事故。

youdao

The cashmere fibers are gentle and soft, if careless they will be damaged, so the sweaters need your special care.

由于羊绒纤维纤细柔和，如不注意极易受损伤，因此需要您特殊的关照和爱护。

youdao

If you have time left, go over everything to make sure you haven't made any careless mistakes.

如果你还有时间，就把所有的东西都检查一遍，确保你没有犯任何粗心的错误。

youdao

If a careless driver jumps a red light, the brakes come on and the train halts.

ECONOMIST: For the sake of a red light

When that happens, I always wonder if they are just careless, unaware of what they should be doing, or are being intentionally abusive to staff and other stakeholders.

FORBES: Lousy Business Communications

Otherwise, your financial, political, and public relations motives could ultimately backfire if your findings are unsubstantiated with careless economic impact estimation techniques.

FORBES: Educating Sports Commissions and CVBs About the Economic Impact of Sports